Submarine telephonic transmitter



H. R. GILSONA SUBMARINE TELEPHONIC TRANSMITTER. APPLICATION FILED SEPT.25,1918. 1,400,283, Patented Dec. 13, 1921,

ATENT l, NEW RUCHELLE, NEW YORK, ASSIGNGR CIQ THE 11 QOIEPAIPI'EZ', 113.CGRPGRATIGN 0F NE'W 3151311153; TE'LIEPK-IONIC TRANSZVIITTEEZApplication flies September 25, 15518.

i T T n is i irinNnY Queen, :1

cl eta rincipnl object of the ini'ention is the on 2 submarinetelephonic transor detector possessing very great nons'veness, and ofsuch character that it ize selective tuned c iapnuigms With- -v ting thenatural period of the latter, so that the sound Waves of the desiredperiod t v be'hesrclnt their maximum to the sion of aii extraneousnoises.

A further object of the invention is to iroviile a detector which he subeccecl shock Without slice-ting the mounting of ne 'lIRVQ-.LlOI1 will.understood by reference to accompanying drawings, in

, 1., is a cross-sectional View of an embodyingthe invention, and

a cross-sectional View illustrating iicetion of the apparatus. eferenceto 1 or the drawings, it

seen that the sppamtus'comprises on. ennuiei" .nsing A into which isthreaded. at enci a. closure plate 1, e pecking 2 being oioyeilhetween'the margin ot'the piste 25 the casing to exclude water. Into thethe casing A is thresdeci u conduit 3 ti admission of the insulatedwires 4, 4* to the conducting cup C, the latter directly upon thediaphragm icting cup C may contain any ""nh 'e mii-zro ohonio material,and its conmay he in accordance with the tics of the art.

port for the diaphragm comprises rubber or other resiLent mi teri e1,ulcunized to the diaphragm, the in tern fittea Within flanged i ingsuitehie Water ti i t conitii. cesing A, in the present n e l annulus 5*is formed of mpeeifieation of Letters Patent.

ork, have invented certain diaphragm and natural. period of the' sure ofthe Water, until. the LEN the clisphiagm maybe recluced or entiw phregm,or to he more exact, or

Serial No. 255,568.

just clescribec the diaphragm is suspended. out of contact with anymetal part oi th casing, by means of a resilientnperiodic sul portingmember. Such a construction avoids one of the principal causes ofdamping and distortion of'transmitted sounds, to wit: the Contact of thediaphragm with a. metallic member of the casing, the letter offeringresistance to the natural vibration oi" the diaphragm and thus affectingthe'naturel periodicity of the latter. in the apparatus of the presentinvention the diephramn is so mounted that its natural period ismainteined.

The present apparatus is such. that the i'liephragm may i J completelyformed prior to its installation in the apparatus. In other words,assuming the diaphragm ;3rior to its instailiition in the apparatus tohave u. periodicity of twelve huncred vibrations per second, it willalso have: it gicrioilicitv of twelve hundred when installed in theFetus; Where, as in the prior art, the dim pis rigiclily mounted so esto contact with a metallic member ithin the ing, is necessary tomanufacture the diaphnigm of a greater thickness than that finallyrequired, and hence with a, higher pitch, and then, after mounting thediephrzigm, to face oil theilstter until after repeated tests, it isfound that the diaphragm possesses the proper period,

It has hereinheiore been stated that in the present embo-tiiment of the'invention the flanged annulus 5 is formed of rubber or other resilientmaterial. The purpose of such constniction is to pemit the inwardmovement of the diaphragm he presthe diaphragm on opposite sides ofequalized.

of the casing is fiuici I in its inward movement a to con pi fiuici, forexample, air, lconteined the said cas By such construction the (lumpingeffect of the external pressureup n Thus, inasmuch as the interior 1 ediaphragm avoided.

In the construction shown n diepl'iregm is mounted at line which mainsstationery sharing its nature}. vibration, in other Words, at the nodalline or c ole.- Ordinarily the diameter of circle is about twoiiillfifis that of the o diameteryof the diaphragm; In the 'vibra tionof the. diaphragm the area within the.

tion the part of the diaphragm outside of the nodal circle is providedwith a shield so that the energy from the sound waves will not beexerted over the entire surface of the diaphragm and so tend to pushboth the inner and outer parts in the same direction at the same time.The said shield consists of the annulus 6 which is secured at 7 to thecasing A and which is arched about the periphery of the diaphragm.

The mounting of the diaphragm at points which under natural vibration ofthe diaphragm remain stationary, very much in-' creases the'ease withwhich the diaphragm is set-in motion and thus greatly increases thesensitiveness of the apparatus. Furthermore, when the sound-waveimpinges upon the diaphragm, the latter,-owing toits resilient mounting,is permitted to move inwardly and outwardly, bodily, as well as tovibrate as a diaphragm\ This inward and outward movement corresponds towhat may be called piston vibration, and is'in unison with thediaphragmatic vibration. The sum total of the piston vibration anddiaphragmatic vibration will be 'in excess of the motion. of adiaphragmlwhich is mounted rigidly as a drum head for example, or one somounted as to be capable of bodily movement, and yet resting" upon ametallicsupporting member. It will thus be seen that the sumof these twovibratory movements acting in unison, will provide greater energy to-beimparted to the conducting cup or microphone, rendering the apparatusmore sensitive and responsive,

jlI1%Ipu IPOSBS is contemplated.

- Patent is:

than would be the case provided energy from the diaphragmatic vibrationalone was available.

While the invention is primarily intended for use as a. submarinetelephonic transmitter or detector, its broad principle is notrestricted thereto, for it broadly comprehends the idea of clamping adiaphragm at a nodal circle or zone where there is no vibration.Therefore, use of the invention in sound-boxes for recording andreproducavmg thus described my invention, what I claim and desire toprotect by Letters 13111 a sound-box, in combination, a casing, avibratory diaphragm, and a resilient support for said diaphragm attachedthereto on a circle whose diameter is substantially two thirds that ofthe diaphragm.

2. The combinationgwlith a diaphragm case, of a flexible annulussupported by the case, and a diaphragm secured at its natural nodalcircle to the said'annulus. v

3. In a submarine telephonic transmitter, a casing, afiexible annulus, adiaphragm mounted at its nodal circle upon t e said annulus, amicrophone, and. a yieldingsup- I 1 .9'

porting member forthe said anniilns where by the diaphragm may 11lo einwmlv 'lynm der external fluid'pressure andact press fluid containedwithin thiti i llg. 4. The combination with aiiia hr'agm case, of aflexible annulus: supporte 'b rthe said case, and a diaphragm sebnred atits normal nodal circle by eohesioirwlth the annulus.

Signed at New-York, in' the count and State of New York, this 24th day 0September, 1918.

HENRY R. GILSON.

